JPH02121531A - Portable radio telephone system - Google Patents

Abstract

PURPOSE:To avoid the heat loss of a regulator that is caused by the voltage drip and at the same time to double the battery capacity at waiting by dividing plural cells into two groups to connect them in series to secure the high voltage output at talking and then to connecting those two groups of cells in parallel to secure the low voltage output at waiting respectively. CONSTITUTION:The voltage of 12V is supplied at talking and therefore a 1st switch circuit 9 uses a transmission start signal 6 to connect the plus (+) terminal of a 1st battery 7 consisting of five cells and securing the terminal voltage of 6V to a 2nd switch circuit 10. The circuit 10 connects the minus (-) terminal of a 2nd battery 8 consisting of five cells and securing the terminal voltage of 6V to the circuit 9. At waiting, the circuit 9 connects the (+) of the battery 7 to an output terminal 12 and the circuit 10 connects the (-) terminal of the battery 8 to a GND respectively. As a result, the battery capacity is doubled at waiting compared with that secured at talking.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a portable radio telephone device, and particularly to an improvement in the configuration of a power supply unit.

Margin below [Prior Art] Conventionally, a portable radio telephone device used in a car radio telephone system is as shown in FIG.

Antenna part 1. Wireless transmitting/receiving section 2. Control unit 6. It is composed of an operation section 4 and a power supply section 5. As shown in FIG. 4, the power supply section 5 uses 10 cells of ML-ca batteries 14 to output a transmission output of 3W to 5W, and supplies power to each section with an output voltage of 12V. Ta. The power supply voltage required for each part is 5V, except for the power amplification circuit in the wireless transmitting/receiving section 2, which generates a transmission output of 3W to 5W during one call. Therefore, except for the power amplifier circuit, a regulator was used to step down the output voltage of the power supply section 5 from 12V to 5V.

[Problem to be solved by the invention]

In the above-mentioned conventional portable radio telephone device, the output voltage of the power supply section is always 12V, and everything except the power amplifier circuit uses a regulator and is used at 5V, so it has the following drawbacks. In other words, especially during standby when the power amplification circuit is not operating, the amount of power supplied to each part is higher than the power supplied to each part.

Due to the voltage drop of 7V, more power was lost in the form of heat in the regulator, resulting in extremely inefficient use of the power supply.

[Means to solve the problem]

The portable radio telephone device of the present invention divides the cells in the power supply unit into two, and supplies an output voltage from the two divided cells connected in parallel to each unit according to a signal from the control unit during standby, and connects them in series during one call. It is characterized by having means for supplying the connected output voltage to each part.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of a power supply section.

In the present invention, the control unit 3 distinguishes between a call time and a standby time, and sends a transmission start signal 6 to the power supply unit 5 during two calls.

As shown in FIG. 2, the transmission activation signal 6 input to the terminal 11 of the power supply section 5 is applied to the first switching circuit 9 and the second switching circuit 10. In order to supply 12V voltage during a call, the transmission start signal 6 causes the first switching circuit 9 to
・In this case, the 10th terminal of the first battery 7 with a terminal voltage of 6V consisting of 5 cells is connected to the second switching circuit 10 side, and in the second switching circuit 10, the second terminal with a terminal voltage of 6V consisting of 5 cells is connected to the second switching circuit 10.
By connecting one terminal of the battery 8 to the first switching circuit 9 side, a voltage of 12V is output to the output terminal 12.

On the other hand, during standby, a voltage of 6V is sufficient and the transmission activation signal 6 is not applied, so the first switching circuit 9 connects the ten terminal of the first battery 7 to the output terminal 12, and
In the second switching circuit 10, one terminal of the second battery 8 is connected to GND.
connected to. In this way, the output terminal 12 has 6
voltage is output, and the battery capacity at this time is twice the battery capacity during talk. Although the voltage supplied to each part is 6V, recent regulators can stably supply 5V even if the voltage difference between input and output is 0.5V, and there is no effect on the two circuits. Incidentally, one terminal of the first battery 7 is fixedly connected to the GND terminal 13, and a terminal of the second battery 8 is fixedly connected to the output terminal 12.

Although the present invention has been described by applying it to an automobile radio telephone system, the present invention is not limited to this, but can also be applied to ordinary portable radio telephones.

〔Effect of the invention〕

As explained above, the present invention divides a plurality of cells into two in the power supply section of a portable radio telephone device.

When making a call, connect these in series to create a high voltage.

By connecting in parallel and outputting low voltage during standby,
Heat loss in the regulator due to voltage drop can be avoided, and the battery capacity during standby can be doubled. This has the effect of lengthening the total usage time or reducing the battery capacity and downsizing.

FIG. 2 is a block diagram of an embodiment of the power supply section of the portable radio telephone device of the present invention.

Figure 3 is a block diagram of a conventional portable wireless telephone device;
The figure is a block diagram of a power supply section of a conventional portable radio telephone device.

In the figure, 7 is a first battery, 8 is a second battery, 9 is a first switching circuit, and 10 is a second switching circuit.

[Brief explanation of the drawing]

Fig. 1 is an actual Fig. 4 of the portable radio telephone device of the present invention.

Claims (1)

[Claims] 1. In a portable radio telephone device having at least a radio transmitting/receiving section, a control section, and a power supply section, two cells in the power supply section are provided.
In response to a signal from a control unit that can determine whether the cell is in standby or talking, the output voltage of the two divided cells connected in parallel is supplied to each part during standby, and the cells are connected in series during talk. A portable radio telephone device characterized by comprising means for supplying an output voltage to each part.